Operating principle and features:
The series HGL, HG pump is really a sort of single-stage and single-cylinder rotary piston vacuum pump. It is significantly improved series H rotary piston pump and involves four patents; its common capabilities possess a excellent improvement.
Rotary piston vacuum pump is often a type of vacuum production products suitable for pumping ordinary gases and condensable gases(when a gas ballast utilised). The pump must be fitted with suitable accessories if gasoline is rich in oxygen, explosive, corrosive to ferrous metal, chemical 
reactive with vacuum pump oil.
Operation principle demonstrate in operating principle graph: A rotary piston with slide valve across ecentric wheel driven by shaft in the housing. Piston pole can slide and swing freely in arch track. The entire pump chamber is divided into chamber A and chamber B by piston. When shaft rotates the volume of chamber A and chamber B are modified repetitively, to ensure pumping purpose could possibly be attained.
The series HGL, HG pump might be a backing pump when mixed with an additional high vacuum pump at the same time as operate singly. It can be extensively utilized in vacuum smelting, vacuum drying, vacuum impregnation and substantial vacuum simulation testing,etc.
ROTARY PISTON VACUUM PUMPS
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